fix circular reference, this will introduce memory leaks

[yinjiawind]

No description provided.

[coveralls]

Coverage increased (+0.05%) to 63.712% when pulling 6924afc on yinjiawind:master into 40dded3 on decalage2:master.

[simonwoerpel]

hello 👋

first, thanks for olefile, we are heavily relying on it for file ingestion since years. :)

just came across this issue. any plans to merge it? i was noticing some files triggering this memory leak, and i downgraded to v0.46 in our stack which seems to work smoothly.

thanks & greetings